What an adventure! Your songs and story are so creative, I would love to play something like this or at least see concept art for some of the cool stuff like the star kids and things that swim in the sky. I got really vivid imagery of the star dunes (my head cannon name for this whole place) while I was listening.
Ok now let's talk about the music, which is lush and dripping with magical energy. I can feel the percussion and percussive-adjacent instruments like piano and plucked strings forming the backbone of the tone in each song. And the variety here was really nice. And I think my favorite part of the sound overall is the vocals/choir doing pad stuff - really brings the emotion up a notch.
And here's some awesome things in no particular order: vocals in Captain of the Sea and Sky and A Starlit Prayer, piano arpeggio and bell melody in Mapping Constellations, the entire vibe in Where the Star Kids Sing, the rising wind effects in One Cosmic Night, the fact that Captain of the Sea and Sky channeled both Pirate of the Caribbean and How to Train Your Dragon, and of course all the creative mystical elements of the story itself, and the bittersweet ending that left me with chills.